Furnace.



LIL'TYQ -G. LE MONT.

FURNACE.

APPLICATION FILED JAN. 4. I915.

Patented Nov. 23, 1915.

2 SHEETS-SHEET I.

a sage through which the hot gases are car- To all whom it'mag concern and which may also be empl pNirEp STATES PATENT onrica.

GEoRGE LE MONT, or

LOS ANGELES, GALTEORNIA, ASSIGNOR 0F ONE-HALF TO GEORGE A. PIKE, 0]? LOS ANGELES, CALIFORNIA.

FURNACE.

Be it known that I, GEoReE LEMoNT, citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful Improvements in Furnaces, of whibh the following is a specification.

This invention relates to a furnace.

It is the object of this invention to. provide a furnace which is particularly adapted for use in hot water or steam-heating plants,

oyed in heating air in hot-air systems.

Another object of this invention is to provide a furnace in which the hot gases generated in the combustion chamber will pass through vertical fire tubes extending through a chamber, through which the medium to be heated is circulated, such medium being delivered to a casing spaced from a chamber forming'a down-draft pasried, thus presenting a large heating surface in a compact space.

A further object is to provide a furnace having an inclosed inner compartment and an inclosed outer compartment encircling the inner compartment and spaced therefrom, with means for delivering the fluid medium to be heated to the outer and inner compartments adjacent their lower ends,

1 through fire tubes in the inner compartment andhaving discharge conduits leading from the outer compartment at its upper end,

with communications between the inner and outer compartments at the upper end of the inner compartment, and in which the hot gases of the. heating medium are passed and drawn downwardly through the space between the inner and outer compartments into a flue.

A further object is to provide means for by-passing the heating gases to the flue on same reaching an abnormal pressure in the furnace whereby a free circulation of. the heating gases .is insured.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a view in side elevation, partly in vertical section, with parts broken away, illustrating the manner of circulating the hot gasesand the heated medium in relation to each other. Fig. 2 is a detail horizontal section, as seen on the line 2-2 of Fig. 1. Fig. 3 is a horizontal sec- Specification of Letters Patent.

. tion chamber 5.

Patented Nov. 23, 1915.

Application filed January 4, 1915. Serial No. 3.44.

tion on the line 3-3 of Fig. 1. Fig. 4c is a detallsection on the line 4. 1 of Fig. 1, illustrating the adjustable counter-weighted relief damper. I V

More specifically, 5 indicates a combustion chamber, which is here shown as formed with a cylindrical wall 6, supported upon abase or floor Z. The wall 6 is encircled by a cylindrical wall 8, spaced therefrom and arranged concentric therewith, forming a space or chamber 9 encircling the combus- The walls 6 and 8 extend to a suitable height and terminate on the same horizontal plane.

-The combustion chamber 5 communicates with the exterior of the Wall .8, through a passage 10, formed by a top wall 11, and side walls 12 and 13, extending between the walls 6 and 8; the passage 10 opening to the combustion chamber through an aperture 14 in the wall 6, and communicating exteriorly of the wall 8, through an opening in the latter. .The opening 15 is normally-closed .by a door 16 on the exterior of the wall 8, and mounted on the latter in' any suitable manner. The wall 8 is formed with an outlet opening 18 at a point diametrically opposite the opening 15, which communicates with a conduit 19, connecting with a. vertical flue 20.

The combustion chamber 5 is here shown as fitted with a burner 21, which may be of any suitable type and adapted to burn oil, gas, or other suitable fuel, which is delivered to the burner 21 through a conduit 22, passing through an opening 23, in the door 16. It is manifest, however, that heat may be generated in the.combustion cham- 'ber 5 in any desired manner.

Arranged above the combustion chamher 5 and seated on the wall 6 is a chamber '25 formed with vertically extending cylindrical side walls 26 and having topand bottom walls 27 and 28, the bottom wall 28 extending over the combustion chamber 5. Extending. vertically through the chamber 25 is a series of fire tubes 29, carried by the walls 27 and 28 and opening therethrough.

Enoircling the wall 26 is a pair of spaced, cylindrical walls 30 and 31, which are connected together at their upper and lower ends by top and bottom walls 32 and 33, forming an annular chamber 3 1. The walls 30 and 26 are supported upon the wall 8, and the wall 30 is spaced from the wall 31,

concentric therewith,-to form a down-draft passage 35, opening at its lower ends to the chamber 9. The upper ends of the walls and 31 extend a short distance above the top wall 27 of the chamber 25, and connect with a top plate or wall 36 which extends ovcr the wall 27 and forms a chamber 37 above the chamber 25, communicating around the upper end of the wall 26 with the annular down-draft passage 35, and to which the upper ends of the fire tubes 29 open.

The wall 36 formed with a flanged opening 38 at its center, which communicates with a downwardly extending by-pass flue 39, having a horizontally disposed portion 40 leading to and opening into the vertical flue 20.

Mounted in the horizontal extending portion 40 of the by-pass flue 39 is a damper 41 having trunnions 42 and 43 pivoted in the side walls of the by-pass flue. The trunnion 43 extends exteriorly of the flue and has an upwardly extending threaded stem 44 thereon, on which a counter weight 45 is threaded for vertical adjustment; The damper 41 has a weight in excess of the counterweight 45, so as to normally dispose the damper 41 in its closed vertical position; the damper 41 being adapted to be rocked on its trunnions 42 and 43 on excess pressure in the by-pass flue to rock the damper to the position indicated in dotted lines in Fig. 1, in opposition to its weight to vent the flue '40 to the flue 20. By adjusting the counterweight 45 on the threaded stem 44, the damper 41 will be adapted to operate to open at different pressures.

Communicating with the chamber 25 at suitable intervals throughout the circumference of the wall 26 adjacent the lower end of the latter is a series of conduits 46 which pass through the walls 30 and 31 and having openings. 47 therein, communicating with the chamber 34 so that fluid passing through I the conduits 46 will enter the chambers25 and 34 adjacent the lower ends. thereof. Extending across the chamber 25 adjacent the upper end thereof is a series of tubes48 which pass through the walls 26 and 30 and form communications between-the chambers 25 and 34, at the upper ends thereof, through which fluid may pass from the chamber 25 to the chamber 34, as will be later described. Connecting with the upper end of the chamber 34 through the top wall 32 thereof, is a series of conduits 49, which lead to any suitable points of discharge, and where the furnace is employed in a hot water heating system, communicate with return pipes not shown, connecting with the intake conduits 46 in the manner common in such systeiias.

In the operation of the invention, water or other fluid to be heated is delivered to the chambers 25 and 34, through the intake pipes 46, whereupon heat is generated in the combustion chamber 5 by means of the burner 21 or in any other suitable manner. The hot gases generated in the combustion chamber 5 pass upwardly through the fire tubes 29 and enter the space 37 above the end wall 27 of the chamber 25, the gases in passing through the tubes 29 heating the latter and thereby heating the fluid in the chamber 25. The gases are then directed downwardly through the annular chamber 35, and thence through the passage 19 and flue 20 by the draft induced in the latter. The' gases in passing downwardly through the chamber 35, heat the walls 26 and 30 and in heating the walls 26 cooperate with their action on the tubes 29 to heat the liquid or fluid in the chamber 25. The heating of the walls 30 operates to raise the temperature of the fluid in the chamber 34, which being comparatively narrow serves to insure a rapid heating of the fluid therein. A circulation of the fluid is maintained through the chambers 25 and 34 by reason of the communication therebetween at the upper and lower ends of the chambers, through the tubes 48 and conduits 46.

By the foregoing described arrangement of heating surfaces, a large area is presented to the heating action of. the gases in proportion to the volume of the fluid adjacent thereto, so as to insure a rapid heating of the fluid with a minimum consumption of fuel.

In event thegases accumulating in the 7 space 37 and by-pass flue 40 become excessive, tending to obstruct the draft to the down-draft chamber 35, the relief damper 41' will automatically operate as before described to vent the by-pass flue 40.

Ininstalling a furnace'suitable valves not shown may be disposed in the conduits 46 and 49 as required for the proper control of the flow of the fluid to be heated through the heating chambers 25 and 34 of the furnace. In applying the furnace as an air heater the conduits 46 open to the atmosphere and form air intake passages 'to the heating chambers 25 and 34, and the conduits 49' form flues for conveying the heated air to suitable registers or other points of discharge; regulating chambers, not shown, being employed in the conduits 46 and 49, as occasion may require.

What I claim is:

1. A furnace comprising a combustion chamber, a heating chamber arranged above the combustion chamber, a secondheating chamber encompassing the first-named chamber,a down-draft passage interposed between said heating chambers, said passage encircling the combustion chamber, means for delivering fluid to be heated to the lower portions of said chambers, communications between the upper ends of said chambers, means for discharging the heated fluid from the upper portion of the outermost chamber, and flues leading through the innermost chamber forming a communication between the combustion chamber and the down-draft passage.

2. A furnace comprising a combustion chamber, an inclosed heating chamber above the combustion chamber, vertically-extend ing fire tubes passing through said heating chamber and communicating with the combustion chamber, a down-draft passage encircling the heating chamber, a second heating chamber encircling the down-draft passage and communicating with the inner heating chamber adjacent the upper end thereof, an intake conduit leading through the outer chamber and communicating with said outer chamber and the inner chamber adjacent their lower' ends, and outlet con duits leading from the outer chamber.

3. A furnace comprising a combustion chamber, a heating chamber arranged thereabove, a second heating chamber encircling the first-named heatingchamber and spaced therefrom to form a down-draft passage, a wall spaced above theinner heating chamber forming a space communicating with the down-draft passage, fire tubes extending through the inner chamber communicating with said space and with the combustion chamber, a chamber encircling the combustion chamber communicating with the lower end of the down-draft passage, a flue communicating with said chamber, a by-pass flue connecting with the wall and. opening to the.

space above the inner heating chamber and A communicating with the first-named flue, a relief valve 1n said by-pass flue, and means chamber, a Wall arranged above the inner chamber forming a space communicating with the upper end of the annular downdraft passage, fire tubes extending through the inner chamber communicating between said space and the combustion chamber, a by-pass flue communicating between said space and the first-named flue, a relief damper in said by-pass flue, means for introducing the fluid to be heated into the lower portions of said inner and outer heating chambers, tubes forming communication between the upper portions of said inner and outer chambers extending across the down-draft passage, and means for discharging the fluid from the upper portion of the outer chamber. p

In witness that I claim the foregoing I have hereunto subscribed my name day of December, 1914.

, GEORGE LE MONT.

Witnesses: I

JAMES M. ABBETT, MARGUERITE BATES.

this 23rd 

